Cash register



Feb. 22, 1938.

K. A. LEHMANN ET AL CASH REGISTER original Filed July 31, 192B l5 Sheets-Sheet l Zero/'zing lnvcntoirs Karl A. Lehmann and Ernst Breitling their Attorney Feb. 22, 1938. K A LEHMANN ET AL 2,108,896

CASH REGISTER Original Filed July 3l, 1928 l5 Sheets-Sheet 2 @0&@0000 00000000 @@@Qwi wwwww.

,and` Erna tling their Attorney Feb. 22, 1938. K. A. LEHMANN .ET AL QSSQS CASH REGISTER AOriginal Filed July 5l, 1928 l5 Sheets-Sheet 5 @n i. JV/. @@@@@@@@qw f @l v n DI .W LJ m@ ny @@@@@@@@mwwm H Mafof my@ @raap inventors Karl A. Lehmann and Ernst Breicing y M their Attorney fafa/12er /fqys F eb. 22, 1938.

Original Filed July 3l, 192B .iwal/nf Keys K. A. LEHMANN ET AL CASH REGI STER l5 Sheets-Sheet 4 x 02 Read/'ng W7 IVe/af /fgys Inventors Karl A. Lehmann and Ernst Breitling their Attorney Feb.' 22, QSS. K A LEHMANN ET' AL 2,108,896

CASH REGISTER @riginal Filed July 5l, 1928 l5 Sheehshee 5 Inventors Karl A. Lehmann and Ernst Breitling By M their Attorney Feb. 22, 1938.

' K. A. LEHMANN ET A1.

CASH REGIS TER 1928 l5 Sheets-Sheet 6 original Filed July si Inventors Karl A. Lehmann and Ernst Breitling their Attorney 22, 1938. LEHMANN ETA-1 CASH REGIS TER K original Filed July 31 1928' l5 Sheetsheet 7 nvenors Karl A. Lehmann and Ernst Breiting y their Attorney CASH REGISTER rignal Filed July El, 1928 l5 Sheets-Sheet 8 jim.

' if@ 15a( lnvenors Karl A. Lehmann and Ernst Breitling www their Attorney l5 Sheets-Sheet 9 K. A. LEHMANN ET AL CASH REGISTER Original Filed July 51 [A zu 5 172 T Feb. 22, i938,

Inventors Karl A. Lehmann and Ernst Breitling By M their Attorney Feb. 22, 1938. K, A, LEHMANN ET Ag, 2,108,893

C ASH REGIS TER Original Filed July 3l, 1928 15,Sheets-Sheet l0 Inventors Karl A. Lehmann and Ernst Breitling their Attorney Feb 22, 3938- K. A. LEHMANN ET AL ,08,896

CASH REGIS TER Original Filed July C51', 1928 l5 Sheets-Sheet 11 Inventors Karl A. Lehmann and Ernst Breitling their Attorney Feb. 22, 1938. K. A. LEHMANN ET AL CASH REGISTER l5 Sheets-Sheet l2 Filed July 5l, 1928 @riginal Inventors Karl A. Lehmann and Ernst Breitling their Attorney Feb. 22, 1938. K. A. LEHMANN ET A1.

CASH REGISTER original Filed July 51, 19128 15 sheets-sheet 13 Inventors Karl A. Lehmann and Ernst Breitling 'MM M their Attorney F65 22, 1938- K. A. LEHMANN ET AL 2,108,896

CASH REGISTER Origins@ Filed July 51, 1928 l5 Sheets-Sheet 14 Inventors Karl A. Lehmann and Ernst Breitling lay/AAL M their Attorney Feb. 22, 1938. K, A LEHMANN ET AL y 2,108,896

CASH REGISTER Original Filed July 31, 1928 l5 Sheets-Sheet 15 inventors Kari A. Lehmann and Ernst Breting Patented Feb. 22, 1938d UNITED STATES PATENT OFFICE CASH REGISTER Original application July 31, 1928, Serial N0. 296,-

445. Divided and this application July 17, 1936, Serial No. 91,134. In Germany August 12,

19 Claims.

The invention relates to cash registers having a plurality of special totalizers to separately record totals of items such as different kinds of taxes, and to also record a total of the transactions entered by the different clerks operating the machine .and is a division of the application for U. S. Letters Patent, Serial No. 296,445 filed July 31, 1928, by Karl A. Lehmann and Ernst Breitling, now Patent No. 2,057,438.

It further relates to that type of machine in which the grand total of all these totalizers, or of certain groups thereof, is accumulated and taken. In cash registers of this type now in use a grand totalizer is provided which accumulates the total of the amounts on the various special totalizers, by being engaged during the operation in which the items are entered on the various totalizers. In this manner a grand total of the separate totals on the special totalizers is accumulated during the course of business.

With the invention, however, the amounts accumulated in the special totalizers are accumulated into a grand total by a series of successive total transferring operations at the end of a business day.

The use of this method has the advantage of requiring only one main or grand totalizer to accumulate a grand total of the .amounts in all the special totalizers, or of the amounts in any particular group or sub-group thereof, whereas in many of the machines now in use a separate main totalizer must be employed for each group or sub-group of special totalizers. The patent to Shipley, No. 1,626,880, is illustrative of an arrangement wherein two main totalizers are provided for two groups of special totalizers.

This method has the additional advantage of not requiring the use of the main totalizer during the course of business, so that this totalizer is free to be used for separate accumulation during this period.

The use of this method furthermore does not duplicate the work of the operator, as it might at first seem, since the same number of operations used to transfer the totals from the special totalizers is necessary, in the normal use of machines of this type, to clear the totals from these totalizers and to record the amounts that were standing thereon.

To realize the chief idea of the invention a series of auxiliary mechanisms are required which substantially consist in mutual blocking and detent mechanisms for the setting means of the totalizers.

In order that the invention may be more easily understood, an embodiment of the same is illustrated by way of example in the drawings that accompany and form part of this specication. In these drawings:

Figures 1 to '7 are diagrammatic illustrations ofthe setting mechanism, with different adjustments thereof,

Figure 8 is a side View of the amount setting mechanism with the appurtenant differentially actuating mechanism and totalizers.

Figure 9 is a section on line IX-IX of Figure 8,

Figure 10 is a side View of the totalizer selecting key setting mechanism with the appurtenant differentially actuating mechanism,

Figure 1l is a front view, partly in section, of a totalizer packet and of the main totalizer,

Figure 12 is a longitudinal section through the setting mechanism for the totalizer controlling mechanism,

Figure 13 is a side View of the mode of operation lever for the individual totalizers,

Figure 13a is a perspective view of the actuating and locking discs shown in Figure 13,

Figure 13b is a perspective view of the actuating and locking discs shown in Figure 12 which control the engagement of the main totalizer with the driving mechanism.

Figure 13o is a side View of the controlling discs for the main totalizer,

Figure 13d is a side View of a detail shown in Figure 21,

Figures 14 to 30 are details of the blocking mechanisms.

General description The cash register hereinafter described is intended to be preferably used in tax offices and the like. The problems to be realized in oiiices of this character in particular consist in separately accumulating each amount introduced in two totalizers according to the kind of the tax and to the mode of payment and to take both the totals and sub-totals from the totalizers allotted to the individual kinds of taxes and modes of payment, and the grand total of the totalizers that accumulate these kinds of taxes and modes of payment. Besides, it must be possible to take the total of a series of entries involved in a single transaction made during the business day in contradistinction to the totals taken at the end of the day.

The setting mechanism of the machine comprises four rows of amount keys l0, Figure 1, three rows of totalizer keys |02, one row of motor keys ISI and two mode of operation levers denoted T and O, which determine whether such operations as the taking of a sub-total or total from a special totalizer or the grand total from the main totalizer are to be performed as well as the simple entering of amounts in these totalizers. Besides each row of totalizer keys |02 a selecting lever A is arranged which serves to select the totalizers in taking totals, instead of the keys |02.

In using the present cash register in a tax ofice, the amount keys serve to adjust the amount of the tax which is introduced by them into two totalizers. One of these totalizers is allotted to the kinds of taxes and is selected by the totalizer keys to I8, while the other of these totalizers belong to the mode of payment (cash, post money order, bank orderor the like). The selection of this totalizer is made by means of the totalizer keys A to N.

The motor keys ll effect the release of the machine operation and control at the same time the engagement of the selected totalizers and the main totalizer. In particular, key M causes the engagement oi the selected totalizers, key T that of the selected totalizers and of the main totalizer, and key T11: the engagement of the main totalizer alone. The BZ key is depressed to release the machine for an idle operation preceding a total taking operation.

The mode of operation lever O determines the operations Addition, Reading Oi (sub-total) or Zeroizing (end total) of the engaged special totalizers, while lever T determines. the operations Addition or Zeroizing (end total) of the main totalizer. When e. g. the levers O and T are set to Adding and key M is depressed, the amount introduced by the amount keys I0 is transmitted to only the two special totalizers that have been selected by the keys |82. However, upon depressing Ykey T instead of M, the transmission takes place also to the main totalizer. Upon depressing the Tx key, instead of either the keys T or M, the amount is entered only int-o the main totalizer. When the lever T is set to Zeroizing, then, upon depressing key Tr, the total is taken from the main totalizer. The machine operates in this manner because the depression of keys T or Tx engages the main totalizer for operation, whereas the depression of key M does not. Wheny the Vsub-total is to be taken from a totalizer selected by the respective lever A, the lever O is set to Reading Oif and key M is depressed. In order to form, at the end of the business time the total of the amounts of the totalizers of each totalizer group, lever O is set to Zeroizing, lever T to Addition and key T is depressed. These manipulations result in the total being taken from the totalizer that has been selected by means of a totalizer lever A, and, further, the additive transmission of the total taken to the main totalizer. The taking of the total from the main totalizer then takes place, as mentioned abo-Ve, by setting level1 T to Zeroizing and depressing the key Tx. The total taking operations are prepared by an idle operation that is released by the blank key Bl. These total taking operations at the end of the business day provide a check for entries made in the special totalizers of the two groups during the day. The main totalizer does not take up the totals of these groups of special totalizers until the end of the business day. It is in a Zeroized condition before the total taking operations are initiated. This main totalizer is available for the totalizing of composite entries during the course of the business day.

It may be noted that only the above-indicated setting possibilities come into consideration in using the machine as a tax oice cash register, and that other possibilities substantially are ei:- cluded by blocking mechanisms provided between the setting means.

Classification totalieers Three totalizer packets I, II, III, see Figure 10, correspond to the three rows |02 of totalizer keys, each packet comprising nine individual totalizers, the totalizer packets I and II allotted to the totalizer keys to i8 serving to regiser the kinds of taxes, while the packet III is allotted to the keys A to N serving to register the modes of payment.

In each of these packets the counting wheels 5G', Figure l1, of the nine totalizers are arranged side by side on a shaft 6I, the wheels 60 of the units, tens, etc. order being united and mounted on the hub 63 of a diiferential wheel 65, Figures 11 and l0, which may be brought into mesh with an intermediate wheel 36, Figures 8 and 10, by rocking the respective totalizer packet. The intermediate wheel 36 is in connection through another intermediate wheel 3'! with a differential wheel 38 common to all differential wheels C55 of the respective order. The diierential wheels 65 may be connected to the counting wheels 50 of one of the nine totalizers of the packet by riders Gti, Figure 11, rotatably but not shiftably mounted on shaft 6| and co-operating with inside teeth 67 of the counting wheels 60 and with 5i a longitudinal groove B4, of hub t3, the riders 66 being set to the respective counting wheels 68 by the shaft 6| being shifted.

This shifting motion of shaft 6| is caused by a step-notched drum H9, Figure 12, the step notch |2| of which is engaged by a roller |24 mounted on a sleeve |23. The latter is connected to a plate |26 that so engages an annular groove of the rider shaft iii, that the latter is forced to take part in the sideways shift of the plate` |26, without being impeded from partaking of the however, it is eifected directly by hand by setting the appurtenant lever A.

Totalieer selecting mechanism The totalizer keys |82 are arranged, like the amount keys I9 and the motor keys |6|, in known manner concentrically with a shaft Figure 10, on which are mounted the diiferential member H33 and the companion differential member |35. The members m3, Ill are so interconnected by a bevel wheel differential gear |01, IGS, |85, Figures l0 and 12, mounted on a shaft 22, that they are moved in known manner from both sides to the foot of the depressed key |02, Figure 1G, by rotation of shaft 22 on which the bevel wheel |539 of said gear is rigidly fixed, and are returned by shaft 22 rotating reversely. In so doing, the members |33, |04 take between them the pin H2, Figures 10 and 12, of a setting member H0, loose on shaft for the indicating .and type wheel and set this member likewise according to the depressed key |02. The setting member is rigidly connected to a segment II3, Figures 10, 12, by a hub ||4, Figure 12. The segment I |3 is in mesh by a series of upper teeth |48, Figure 10, with a pinion 41 mounted on a shaft |46, and by a lower series of teeth with a pinion H5, Figures 10, 12, mounted on the shaft 22. The pinion ||5 is connected through a hub ||6, Figure 12, to a toothed segment ||1 that engages a pinion |8 carried by the step-notched drum of the totalizer packet in consideration. Owing to this arrangement upon the rotation of shaft 22 taking place during the operation of the machine, also the drum ||9 is set according to the key depressed in the appurtenant row of keys |02, whereby the rider shaft 6| is shifted sideways and the totalizer corresponding to the depressed key |02 is coupled with the differential wheels 65, Figure 11.

Interlocking mechanism A key locking mechanism is provided in each row of the totalizer keys |02, Figures 10 and 12, which is formed by rocking levers |63 pivoted on pins |62. A Zero stop pawl |61, |68 is pivotally mounted on pin |66 near the uppermost rocking lever |63, Figure 10, the upwardly directed arm |61 of which pawl under the -action of a spring |64 abuts on the uppermost rocking lever |63, whilst the lower hook-shaped arm |68 of the pawl engages a segment |1| rigidly connected to the differential member |03 and holds the latter in position of rest as long as no key |02 is depressed. Upon depressing a key |02, a lateral pin |12 fast thereon penetrates between the adjacent rocking levers |63, whereby the zero stop pawl |68 executes a rocking motion in clockwise direction about pin |66 and thereby releases the differential member |03. The rocking amplitude of the pawl |68 is so limited, that only one single pin |12 is able to penetrate between the rocking levers |63, so that a simultaneous depression of more than one key of the row is rendered impossible. Similar mechanisms are provided with the rows of amount keys |0 and with the row of motor keys |6|. This latter row however possesses only a lever |13, Figure 19, instead of a zero stop pawl, and the key denoted by BZ does not co-operate with the key excluding mechanism. Besides the described key excluding mechanism releasable locking means (not shown) are provide in each row of keys, which means lock the keys in depressed position until they are released at the end of the machine operation.

Idle preparatory operation The levers A, Figure 10, loosely mounted on shaft are held in the position to which they are moved by a resilient pawl |43 engaging a series of notches |49 provided on the narrow front faces of the levers A. On the rear, the levers A carry a series of teeth |45 co-operating with the pinion |41. In the position of rest of the lever A, Figure 10, the teeth |45 are out of gear with the pinion |41. As soon, however, as the lever A is moved from position of rest, the teeth |45 engage pinion |41 and position it and therewith the step-notched drum ||9 positively connected thereto according to that key |02 beside which the lever A has been set. As the setting members H0, which as described are secured to segments |3 permanently in mesh with the pinions |41 by the teeth |48, remain between operations, in their positions imparted to them in the preceding operation, special means must be provided to permit the teeth |45 of lever A to engage the pinion 41 only if the setting members ||0 and segments |3 are in their uppermost or home position. This object is obtained by an idle operation of the machine being executed before the first depression of a lever A, in which operation all setting members l I0 are moved to their home position above mentioned. Special interlocking means for enforcing this idle operation previous to a setting of totalizer levers A is described hereinafter. Levers A are blocked against movement until an idle operation renders free the mode of operation levers T and O, the setting of which releases the levers A. Thus assurance is had that the control exercised by the levers A` upon the setting members is initiated when those members are in their home position.

Amount dierential mechanism The amounts introduced by the keys |0, Figures 1, 8, 9, are transmitted to the differentially actuating wheels 38, Figure 8, by the amount differential mechanism. This mechanism is designed in a manner similar to that of the described totalizer key differential mechanism. It consists of the differential member I2 mounted on the shaft and of the companion differential member |4, said two members being so connected with one another by means of a differential gear 24, 26, arranged on shaft 22, that upon shaft 22 rotating, they are moved from both sides like tong jaws toward the foot of the depressed key I0, whereby they take with them the pin 48 into a position corresponding to the depressed key, the setting member 41, Figure 9, actuating the respective indicating and type wheel. The differential wheels 38, common to all totalizer packets, are in rigid connection with the bevel wheels 24 of the differential gear, which wheels are positively connected with the differential members i2 by the segment |1, so that the differential wheels 38 are rotated corresponding to the depressed amount keys |0 in each differential operation.

Classification totaliee1` engaging mechanism The engagement of the differential wheels 64, Figure 8, with the intermediate wheels 36 is established by rocking the shaft 12 on which the totalizer frames are rigidly fixed. To this end an arm 15, Figures 10, 12 rigid on shaft 1.2 embraces by two rollers 16 an eccentric 11 fast on a shaft 14. The three shafts 14 of the three totalizer packets I, II, III are in mesh through wheels 18, Figure 12 with a common wheel 19, which is fixed on a sleeve 8| shiftably mounted on shaft 22 and carries a crown of actuating teeth 82 and a crown of locking teeth 83. The actuating teeth 82 are adapted to co-operate with three actuating members, 81, 88, 89, Figure 13, each carrying two pairs of actuating teeth i0l, Figure 13. The locking teeth 83 co-operate with correspondingly designed locking discs 84, 85, 86 in the manner of a Maltese cross locking device. The locking members and actuating discs 84 to 89 are rigid on shaft The sleeve 8| may be shifted by the mode of operation lever O, Figures 13, 12, mounted on shaft in such a manner, that the teeth 82 will lie in the plane of any one of the three actuating members 81 to while at the same time the teeth 83 will lie in the plane of the corresponding locking member 84 to 86. This shift of sleeve 8| is obtained by a step-notched segment 91, Figure 12, rigidly connected to lever O, Figure 13, the step notch 96 of which segment is engaged by a roller 95, the pivot of which is rotatably but not shiftably connected to sleeve 8|. During the operation of the machine, where one full revolution is imparted to shaft a full revolution, composed of two sections of degrees each, is imparted to shaft 14, Figure 12, by the actuating and locking members 84 to 89, which revolution acts in such a manner on the totalizer packets I, II, III, Figure 10, through the eccentrics 11, that by the first section of this rotation the packets are rocked into gear and by the other section they are rocked out. These sectional rotations take place at different times, according to which pair of the actuating and locking members 84 t0 89, Figure 12, is in mesh with the teeth 82, 83.

In the position of rest, corresponding to Addition, of the mode of operation lever O, Figures 12, 13, the throwing into and out of gear of the totalizer packets is determined by the members 84, 81 belonging to the adding operation; in the position Reading off of lever O, by the members 85, 88 belonging to the operation of taking a sub-total; and in the position Zeroizing, by the members 86, 89 belonging to the operation of taking the grand total. Consequently, in the rst case (addition) the packets are thrown-in before the beginning of the return motion of the amount differential members 38, Figure 10, and are thrown-out at the end of this motion; in the second case (reading off) the packets are thrownin before the beginning of the forward motion of the differential wheels 38 and thrown-out after their return motion has been terminated; whilst in the third case (Zeroizing) they are thrown-in before the beginning of the forward motion of wheels 38 and thrown-out after this forward motion has been terminated. In adding operations the amount set by the amount keys I9 is transmitted to the totalizers that have been selected by means of the amount keys |02. In reading off, the total contained in the totalizers thrown-in by means of the levers A is transmitted to the indicating and printing mechanism, the counting wh-eels being returned to the position they assumed before reading oi. In zeroiZing, however, the counting wheels remain in zero position after the total has been transmitted to the indicating and printing mechanism.

M ain totdlieer The main totalizer is lodged in the portion denoted by IV, Figure 10, of the machine. Its construction is similar to that of the totalizer packets I to III. Instead of nine counting wheels, however, only one counting wheel |15, Figure 11, is provided in each order; which wheel may be coupled with the differential Wheel |18, that co-operates with the appurtenant intermediate Wheel 36, by means of a rider |16 by the rider shaft |11 being shifted. This shifting motion of shaft |11 to throw the main totalizer into and out of gear is obtained by means of a special step-notched drum |19, Figure l2, which is connected with the shaft |11 in a manner similar to the connection of drum |I9 with the rider shaft 6I, Viz. by a roller ISI, Figure 10, a shiftable sleeve |32, and a plate |83. The drum |19, Figure l2, is mounted on a shaft |84 and is in permanent connection with a disc |89 through a crown of teeth |86, Figure l2, a segment |81 mounted on shaft 22 and a pinion |88 connected to the segment which disc |89 is rigidly connected by a hub ISI with the setting member |92 of the motor key board |6I.

The diierential mechanism of the motor key board is designed like the amount differential mechanism. The two diiferentially actuating members |93 and |94, Figure 12, interconnected through a differential gear |95, |96, |91, are moved from both sides toward the foot of the depressed motor key I6| by the rotation of shaft 22 and thereby adjust the setting member |92 together with the indicating and type wheel connected thereto corresponding to the depressed motor key. The step notch |98 of the drum |19 is cut in such a manner, that the main totalizer is thrown out of gear upon the setting member |92 being set to the keys Bl and M, Figure 1, and is thrown into gear upon these members being set to the keys T' and Tm.

Main totalzeer engaging controls The selection of the mode of operation of the main totalizer is performed by special locking and actuating discs 20| to 204 mounted on shaft and (zo-operating in the manner of a Maltese cross locking device with crowns of locking and actuating teeth 205, 206 of a shifting sleeve 208 that is connected with a toothed wheel 201. The latter is in mesh with a wheel 209 fast on shaft |84. This Shaft carries on its other end an eccentric 2| I, Figure 10, co-operating with two rollers 2|3 of the rocking shaft 2 I4 of the totalizer frame 2 I 5 of the main totalizer. The sleeve 208, Figure 12, is in connection through a roller 2 I6, with a stepnotched segment 2|1, on which the mode of operation lever T for the main totalizer is rigidly fixed. This mode of operation controlling mechanism acts in a manner similar to that allotted to the special totalizers. In the home position of the lever T the toothed crowns 205, 206 cooperate with the mode of operation discs 20|, 293 intended for adding operations, so that the amount set in the amount differential wheels 38 by the keys I6 or by taking the total from one of the individual totalizers is transferred additively to the main totalizer, provided the proper key in the motor key bank was depressed to cause the main totalizer to be engaged for this operation. In the position Zeroizing of the lever T the teeth 205, 206 (zo-operate with the discs 202, 208 intended for taking the grand total, the total contained in the main totalizer being transferred to the indicating and printing mechanism and the main totalizer being zeroized. A mode of operation Reading ofi is not provided for the main totalizer.

Machine release The release and start of the operation of the machine is caused by depressing one of the motor keys 16|. The above-mentioned lever |13, Figure 19, of the key excluding mechanism of the motor key board, is pivoted by a pin 2|8 to a slide 22|, the lower end of which is guided on a cross bar 2|9. This slide 22| is connected to the releasing lever 224 by a pin and slot connection 222, 223. Upon depressing one of the motor keys M, T and T33, the slid-e 22| is shifted upward due to the appurtenant key pin |12 penetrating between the respective two neighboring rocking levers |63, whereby the releasing lever 22d is moved into releasing position, this causing the start of the machine operation.

A special slide 225, Figure 20, is provided for the idle operation key denoted by BZ, as this key does not co-operate with the key excluding mechanism |63 of the motor key board. This slide 225 is Cir Cil

guided on its top on a fixed cross bar 226 and has at its lower end a slot (not shown) in which engages the pin 223, Figure 19, of the releasing lever 224 in the same manner as the slide 22|. The

, slide 225 has a slope face 221 located in the range of the pin |12 of the idle key, by which face slide 225 is moved when the key is depressed.

The blocking mechanisms In order to execute with security the aboveindicated calculating operations, the machine is equipped with blocking mechanisms between the setting means in such a manner, that the operator is forced in every state of the machine either to continue the operation just commenced or in certain cases to select one of the operations that can be continued.

Interlock between amount keys and idle operation key B1 In the rear of the upper portion of the setting mechanism, are rotatably mounted in the machine frame three shafts, viz. a blocking shaft 228, Figure 8, a locking shaft 229, and a shaft 239. The blocking shaft 228 has rigidly mounted on it in the range of each row of amount keys a lug 23|, Figures 8, 14, which co-operates with a pin 232 or the like of a slide 233. The latter is hinged on its front end to the `zero stop pawl 29, Figures 8, 15, of the respective row of amount keys and is guided by a link 234 pivoted on the machine frame. Upon an amount key I being depressed, the zero pawl is rocked as described above, and the slide 233 is moved backward. This causes the shaft 228 to turn in clockwise direction out of position of rest, in which it abuts on a stop 236, Figure 8, under the action of a spring 235. In the range of the motor key board the shaft 228 carries a locking lug 231, Figure 20, that co-operates with a nose 233 of the slide 225 influenced by the idle operation key Bl. When shaft 228 turns, lug 231 arrives before the nose 238 and locks key Bl against eing depressed. Inversely, the amount keys are locked, when by depressing key Bl the nose 238 has been shifted into the path of lug 231 and thus prevents rotation of shaft 228.

Release of special key upon depression of amount keys Furthermore, the shaft 228 carries, in the range of the two rows of totalizer keys I to 9 and I8 to I8, the lugs 239, 239' respectively, Figures 10, i6, 17, which in the position of rest of shaft 228 are opposite a stop 24| of a slide 242, Figures 1i), 16, of the row of totalizer keys I to 9, and opposite a stop 24|' of a slide 243, Figure 17, of the row of totalizer keys I6 to I8.

The slide 242, Figures 10, 16, is hinged to the Zero stop pawl |68. Slide 243, Figure 17, is hinged to the upper lever' 244 of the key excluding mechanism of the totalizer key row I9 to I8, to the latter of which the appurtenant zero stop pawl 245 is yieldingly connected by a spring 246. As long as no amount key I8 is depressed, the totaliaer keys i to I8 are locked by the lugs 239 and 239. Upon an amount key being depressed, these lugs are rocked upwards and release the stops 24|, 24| and therewith the totalizer keys to I 8.

Interlock between rows of special keys 1 to 18 In order to permit only one of the totalizer keys l to IS to be depressed, a locking arrangement is provided between rows I to 8 and Il) to I8. This arrangement consists of a sleeve 241, Figures 16, 17, mounted on shaft 228 and having a lug 248, Figure 16, which co-operates with a pin 249 of the slide 242 of the totalizer key-s to 9. On the right, the sleeve has a nose 25|, Figure 17, co-operating with the stop 24 I of slide 243 of the row of totalizer keys I9 to I8. Upon one of the totalizer keys to 9 being depressed, the sleeve 241 is rotated in clockwise direction by the pin 249, Figure 16, and lug 248 against the action of a spring 252, so that the nose 25| arrives in the path of stop 24| and locks the keys I6 to I8. Upon one of the totalizer keys Il) to I8 being depressed, the keys to 9 are locked by the sleeve 241 being locked by stop 24|', Figure 17, that has arrived above the nose 25|.

Release of special keys A to N The totalizer keys A to N are normally locked by a nose 253, Figure 18, which is opposite a lug 254 of a slide 256 hinged to the zero stop pawl 255 of the key board A to N. The nose 253 is carried by a yoke 251, Figure 14, which is rockably mounted on shaft 228 and held in the position shown in Figure 18 by a spring 258. The yoke 251 carries two set screws 259 and 26|, Figure 14, the screw 259 abutting on lug 248, Figure 16, of sleeve 241, while screw 26| abuts on an extension 262, Figure 17, of slide 243. Upon one of the totalizer keys I to I8 being depressed, the yoke 251 is swung against the action of spring 258, Figure 18, and the nose 253 is moved out of the path of the lug 254, so that one of the totalizer keys A to N is able to be depressed.

Release of motor keys by keys A to N The slide 256, Fi-gure 18, of the keys A to N co-operates with an arm 265 rigid on sleeve 264 by means of a pin 263. on its other end a nose 266, Figures 14, 19, which normally is opposite a stop 261 of a slide 268 hinged to the upper lever |13 of the excluding mechanism of the motor keys M, T', Tx, and locks these motor keys. Upon one of the keys A to N being depressed, sleeve 254, Figure 18, is rocked in clockwise direction against the action of a spring 269, the nose 266, Figure 19, thereby releasing the motor keys M, T and Ta: for depression.

As can be seen from the foregoing, rstly only the amount key I 9 and the motor key Bl are free, while all other keys are in locked state, and one of the motor keys M, T', T can only be depressed after the successive depression of an amount ke-y, of one of the totalizer keys I to I8 and of one of the totalizer keys A to N. When an amount key is depressed, the other keys of the respective row are locked by the key excluding mechanism |63, |12. The non-depressed totalizer keys are locked partly by the appurtenant excluding mechanism |63, |12 and partly by the mutual blocking members 248, 25|, Figures 16, 17.

Amount key locked by depression of motor keys In order to lock also the amount keys of the rows in which no keys have been depressed, the locking shaft 299, Figure 19, carries a lug 21| which through an intermediate lever 212 cooperates with a pin 213 of the slide 268. In the range of the rows of the amount keys the locking shaft 229 has rigid on it lugs 214, Figures 14, 15, on which abut, under the action of springs 215, locking arms 216 loose on shaft 229 and co-operating with extensions 211 of the slides 233. By depressing one of the motor keys M, T', Tx, the

direction by the intermediate lever 212, Figure The sleeve 264 carries' 

